From: Jani Nikula <jani@nikula.org>
To: david@tethera.net, notmuch@notmuchmail.org
Subject: Re: [Patch v3b 1/9] notmuch-dump: add --format=(batch-tag|sup)
In-Reply-To: <1354843607-17980-2-git-send-email-david@tethera.net>
References: <1354843607-17980-1-git-send-email-david@tethera.net>
	<1354843607-17980-2-git-send-email-david@tethera.net>
User-Agent: Notmuch/0.14+138~g7041c56 (http://notmuchmail.org) Emacs/23.4.1
	(i686-pc-linux-gnu)
Date: Sat, 08 Dec 2012 00:21:06 +0200
Message-ID: <8738zhzep9.fsf@nikula.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: David Bremner <bremner@debian.org>
Precedence: list


LGTM.

On Fri, 07 Dec 2012, david@tethera.net wrote:
> From: David Bremner <bremner@debian.org>
>
> sup is the old format, and remains the default, at least until
> restore is converted to parse this format.
>
> Each line of the batch-tag format is modelled on the syntax of notmuch tag:
> - "notmuch tag" is omitted from the front of the line
> - The dump format only uses query strings of a single message-id.
> - Each space seperated tag/message-id is 'hex-encoded' to remove
>   trouble-making characters.
> - It is permitted (and will be useful) for there to be no tags before
>   the query.
>
> In particular this format won't have the same problem with e.g. spaces
> in message-ids or tags; they will be round-trip-able.
> ---
>  dump-restore-private.h |   13 +++++++++++++
>  notmuch-dump.c         |   48 ++++++++++++++++++++++++++++++++++++++++++------
>  2 files changed, 55 insertions(+), 6 deletions(-)
>  create mode 100644 dump-restore-private.h
>
> diff --git a/dump-restore-private.h b/dump-restore-private.h
> new file mode 100644
> index 0000000..896a004
> --- /dev/null
> +++ b/dump-restore-private.h
> @@ -0,0 +1,13 @@
> +#ifndef DUMP_RESTORE_PRIVATE_H
> +#define DUMP_RESTORE_PRIVATE_H
> +
> +#include "hex-escape.h"
> +#include "command-line-arguments.h"
> +
> +typedef enum dump_formats {
> +    DUMP_FORMAT_AUTO,
> +    DUMP_FORMAT_BATCH_TAG,
> +    DUMP_FORMAT_SUP
> +} dump_format_t;
> +
> +#endif
> diff --git a/notmuch-dump.c b/notmuch-dump.c
> index 88f598a..d2dad40 100644
> --- a/notmuch-dump.c
> +++ b/notmuch-dump.c
> @@ -19,6 +19,7 @@
>   */
>  
>  #include "notmuch-client.h"
> +#include "dump-restore-private.h"
>  
>  int
>  notmuch_dump_command (unused (void *ctx), int argc, char *argv[])
> @@ -43,7 +44,13 @@ notmuch_dump_command (unused (void *ctx), int argc, char *argv[])
>      char *output_file_name = NULL;
>      int opt_index;
>  
> +    int output_format = DUMP_FORMAT_SUP;
> +
>      notmuch_opt_desc_t options[] = {
> +	{ NOTMUCH_OPT_KEYWORD, &output_format, "format", 'f',
> +	  (notmuch_keyword_t []){ { "sup", DUMP_FORMAT_SUP },
> +				  { "batch-tag", DUMP_FORMAT_BATCH_TAG },
> +				  { 0, 0 } } },
>  	{ NOTMUCH_OPT_STRING, &output_file_name, "output", 'o', 0  },
>  	{ 0, 0, 0, 0, 0 }
>      };
> @@ -83,27 +90,56 @@ notmuch_dump_command (unused (void *ctx), int argc, char *argv[])
>       */
>      notmuch_query_set_sort (query, NOTMUCH_SORT_UNSORTED);
>  
> +    char *buffer = NULL;
> +    size_t buffer_size = 0;
> +
>      for (messages = notmuch_query_search_messages (query);
>  	 notmuch_messages_valid (messages);
>  	 notmuch_messages_move_to_next (messages)) {
>  	int first = 1;
> +	const char *message_id;
> +
>  	message = notmuch_messages_get (messages);
> +	message_id = notmuch_message_get_message_id (message);
>  
> -	fprintf (output,
> -		 "%s (", notmuch_message_get_message_id (message));
> +	if (output_format == DUMP_FORMAT_SUP) {
> +	    fprintf (output, "%s (", message_id);
> +	}
>  
>  	for (tags = notmuch_message_get_tags (message);
>  	     notmuch_tags_valid (tags);
>  	     notmuch_tags_move_to_next (tags)) {
> -	    if (! first)
> -		fprintf (output, " ");
> +	    const char *tag_str = notmuch_tags_get (tags);
>  
> -	    fprintf (output, "%s", notmuch_tags_get (tags));
> +	    if (! first)
> +		fputs (" ", output);
>  
>  	    first = 0;
> +
> +	    if (output_format == DUMP_FORMAT_SUP) {
> +		fputs (tag_str, output);
> +	    } else {
> +		if (hex_encode (notmuch, tag_str,
> +				&buffer, &buffer_size) != HEX_SUCCESS) {
> +		    fprintf (stderr, "Error: failed to hex-encode tag %s\n",
> +			     tag_str);
> +		    return 1;
> +		}
> +		fprintf (output, "+%s", buffer);
> +	    }
>  	}
>  
> -	fprintf (output, ")\n");
> +	if (output_format == DUMP_FORMAT_SUP) {
> +	    fputs (")\n", output);
> +	} else {
> +	    if (hex_encode (notmuch, message_id,
> +			    &buffer, &buffer_size) != HEX_SUCCESS) {
> +		    fprintf (stderr, "Error: failed to hex-encode msg-id %s\n",
> +			     message_id);
> +		    return 1;
> +	    }
> +	    fprintf (output, " -- id:%s\n", buffer);
> +	}
>  
>  	notmuch_message_destroy (message);
>      }
> -- 
> 1.7.10.4
>
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